Foundation for a shed
Good point, those things are not even legal in Florida. I see them
occasionally at some national chain stores but the code people can
make you remove it.
Code folks here (FL) won't do anything about them.
My neighbor had to remove one. That is why I know.
I love this. It's like someone asking, "How's the weather?"
Now comes the "NO, IT'S NOT. YOU'RE AN IDIOT!" replies.
What's legal and illegal about sheds is about as varied as the weather.
It's a good idea to check on it WHERE YOU LIVE.